Application of “soft canning” heat preservation technique in the superalloy forging process

The “soft canning” heat preservation technique is invented by Baoshan Iron & Steel Co.,Ltd.(Hereafter referred to Baosteel),using the flexible insulation material which can be stuck on the surface of the heated ingot or billet in the superalloy thermal process.This adhesive insulation material can reduce the temperature drop of the ingot or billet during the transferring or hot working process,and can deform with the billet without dropping.The surface temperature drop can be effectively reduced,so the products can be obtained a good surface quality and the structural uniformity can be improved.The technique is applied to hard-wrought superalloy forging of cogging,superalloy rods finished forging fire and superalloy hot die forging processing,and good results have been achieved.